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4f911138c8
The immutable and append-only properties on an inode are published on the inode's i_flags and enforced by the VFS. Create a helper to fill the corresponding STATX_ATTR_ flags in the kstat structure from the inode's i_flags. Only orange was converted to use this helper. Other filesystems could use it in the future. Suggested-by: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
792 lines
21 KiB
C
792 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/fs/stat.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#include <linux/export.h>
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#include <linux/mm.h>
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#include <linux/errno.h>
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#include <linux/file.h>
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#include <linux/highuid.h>
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#include <linux/fs.h>
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#include <linux/namei.h>
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#include <linux/security.h>
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#include <linux/cred.h>
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#include <linux/syscalls.h>
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#include <linux/pagemap.h>
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#include <linux/compat.h>
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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#include "internal.h"
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#include "mount.h"
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/**
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* generic_fillattr - Fill in the basic attributes from the inode struct
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* @mnt_userns: user namespace of the mount the inode was found from
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* @inode: Inode to use as the source
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* @stat: Where to fill in the attributes
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*
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* Fill in the basic attributes in the kstat structure from data that's to be
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* found on the VFS inode structure. This is the default if no getattr inode
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* operation is supplied.
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*
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* If the inode has been found through an idmapped mount the user namespace of
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* the vfsmount must be passed through @mnt_userns. This function will then
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* take care to map the inode according to @mnt_userns before filling in the
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* uid and gid filds. On non-idmapped mounts or if permission checking is to be
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* performed on the raw inode simply passs init_user_ns.
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*/
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void generic_fillattr(struct user_namespace *mnt_userns, struct inode *inode,
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struct kstat *stat)
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{
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stat->dev = inode->i_sb->s_dev;
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stat->ino = inode->i_ino;
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stat->mode = inode->i_mode;
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stat->nlink = inode->i_nlink;
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stat->uid = i_uid_into_mnt(mnt_userns, inode);
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stat->gid = i_gid_into_mnt(mnt_userns, inode);
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stat->rdev = inode->i_rdev;
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stat->size = i_size_read(inode);
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stat->atime = inode->i_atime;
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stat->mtime = inode->i_mtime;
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stat->ctime = inode->i_ctime;
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stat->blksize = i_blocksize(inode);
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stat->blocks = inode->i_blocks;
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}
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EXPORT_SYMBOL(generic_fillattr);
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/**
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* generic_fill_statx_attr - Fill in the statx attributes from the inode flags
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* @inode: Inode to use as the source
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* @stat: Where to fill in the attribute flags
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*
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* Fill in the STATX_ATTR_* flags in the kstat structure for properties of the
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* inode that are published on i_flags and enforced by the VFS.
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*/
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void generic_fill_statx_attr(struct inode *inode, struct kstat *stat)
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{
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if (inode->i_flags & S_IMMUTABLE)
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stat->attributes |= STATX_ATTR_IMMUTABLE;
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if (inode->i_flags & S_APPEND)
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stat->attributes |= STATX_ATTR_APPEND;
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stat->attributes_mask |= KSTAT_ATTR_VFS_FLAGS;
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}
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EXPORT_SYMBOL(generic_fill_statx_attr);
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/**
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* vfs_getattr_nosec - getattr without security checks
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* @path: file to get attributes from
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* @stat: structure to return attributes in
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* @request_mask: STATX_xxx flags indicating what the caller wants
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* @query_flags: Query mode (AT_STATX_SYNC_TYPE)
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*
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* Get attributes without calling security_inode_getattr.
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*
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* Currently the only caller other than vfs_getattr is internal to the
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* filehandle lookup code, which uses only the inode number and returns no
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* attributes to any user. Any other code probably wants vfs_getattr.
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*/
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int vfs_getattr_nosec(const struct path *path, struct kstat *stat,
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u32 request_mask, unsigned int query_flags)
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{
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struct user_namespace *mnt_userns;
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struct inode *inode = d_backing_inode(path->dentry);
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memset(stat, 0, sizeof(*stat));
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stat->result_mask |= STATX_BASIC_STATS;
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query_flags &= AT_STATX_SYNC_TYPE;
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/* allow the fs to override these if it really wants to */
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/* SB_NOATIME means filesystem supplies dummy atime value */
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if (inode->i_sb->s_flags & SB_NOATIME)
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stat->result_mask &= ~STATX_ATIME;
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/*
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* Note: If you add another clause to set an attribute flag, please
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* update attributes_mask below.
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*/
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if (IS_AUTOMOUNT(inode))
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stat->attributes |= STATX_ATTR_AUTOMOUNT;
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if (IS_DAX(inode))
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stat->attributes |= STATX_ATTR_DAX;
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stat->attributes_mask |= (STATX_ATTR_AUTOMOUNT |
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STATX_ATTR_DAX);
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mnt_userns = mnt_user_ns(path->mnt);
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if (inode->i_op->getattr)
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return inode->i_op->getattr(mnt_userns, path, stat,
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request_mask, query_flags);
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generic_fillattr(mnt_userns, inode, stat);
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return 0;
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}
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EXPORT_SYMBOL(vfs_getattr_nosec);
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/*
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* vfs_getattr - Get the enhanced basic attributes of a file
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* @path: The file of interest
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* @stat: Where to return the statistics
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* @request_mask: STATX_xxx flags indicating what the caller wants
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* @query_flags: Query mode (AT_STATX_SYNC_TYPE)
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*
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* Ask the filesystem for a file's attributes. The caller must indicate in
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* request_mask and query_flags to indicate what they want.
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*
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* If the file is remote, the filesystem can be forced to update the attributes
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* from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can
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* suppress the update by passing AT_STATX_DONT_SYNC.
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*
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* Bits must have been set in request_mask to indicate which attributes the
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* caller wants retrieving. Any such attribute not requested may be returned
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* anyway, but the value may be approximate, and, if remote, may not have been
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* synchronised with the server.
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*
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* 0 will be returned on success, and a -ve error code if unsuccessful.
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*/
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int vfs_getattr(const struct path *path, struct kstat *stat,
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u32 request_mask, unsigned int query_flags)
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{
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int retval;
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retval = security_inode_getattr(path);
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if (retval)
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return retval;
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return vfs_getattr_nosec(path, stat, request_mask, query_flags);
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}
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EXPORT_SYMBOL(vfs_getattr);
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/**
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* vfs_fstat - Get the basic attributes by file descriptor
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* @fd: The file descriptor referring to the file of interest
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* @stat: The result structure to fill in.
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*
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* This function is a wrapper around vfs_getattr(). The main difference is
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* that it uses a file descriptor to determine the file location.
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*
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* 0 will be returned on success, and a -ve error code if unsuccessful.
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*/
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int vfs_fstat(int fd, struct kstat *stat)
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{
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struct fd f;
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int error;
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f = fdget_raw(fd);
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if (!f.file)
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return -EBADF;
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error = vfs_getattr(&f.file->f_path, stat, STATX_BASIC_STATS, 0);
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fdput(f);
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return error;
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}
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/**
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* vfs_statx - Get basic and extra attributes by filename
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* @dfd: A file descriptor representing the base dir for a relative filename
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* @filename: The name of the file of interest
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* @flags: Flags to control the query
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* @stat: The result structure to fill in.
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* @request_mask: STATX_xxx flags indicating what the caller wants
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*
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* This function is a wrapper around vfs_getattr(). The main difference is
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* that it uses a filename and base directory to determine the file location.
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* Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink
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* at the given name from being referenced.
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*
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* 0 will be returned on success, and a -ve error code if unsuccessful.
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*/
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static int vfs_statx(int dfd, const char __user *filename, int flags,
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struct kstat *stat, u32 request_mask)
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{
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struct path path;
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unsigned lookup_flags = 0;
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int error;
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if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | AT_EMPTY_PATH |
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AT_STATX_SYNC_TYPE))
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return -EINVAL;
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if (!(flags & AT_SYMLINK_NOFOLLOW))
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lookup_flags |= LOOKUP_FOLLOW;
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if (!(flags & AT_NO_AUTOMOUNT))
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lookup_flags |= LOOKUP_AUTOMOUNT;
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if (flags & AT_EMPTY_PATH)
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lookup_flags |= LOOKUP_EMPTY;
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retry:
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error = user_path_at(dfd, filename, lookup_flags, &path);
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if (error)
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goto out;
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error = vfs_getattr(&path, stat, request_mask, flags);
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stat->mnt_id = real_mount(path.mnt)->mnt_id;
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stat->result_mask |= STATX_MNT_ID;
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if (path.mnt->mnt_root == path.dentry)
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stat->attributes |= STATX_ATTR_MOUNT_ROOT;
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stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT;
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path_put(&path);
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if (retry_estale(error, lookup_flags)) {
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lookup_flags |= LOOKUP_REVAL;
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goto retry;
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}
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out:
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return error;
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}
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int vfs_fstatat(int dfd, const char __user *filename,
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struct kstat *stat, int flags)
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{
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return vfs_statx(dfd, filename, flags | AT_NO_AUTOMOUNT,
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stat, STATX_BASIC_STATS);
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}
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#ifdef __ARCH_WANT_OLD_STAT
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/*
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* For backward compatibility? Maybe this should be moved
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* into arch/i386 instead?
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*/
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static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
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{
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static int warncount = 5;
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struct __old_kernel_stat tmp;
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if (warncount > 0) {
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warncount--;
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printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
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current->comm);
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} else if (warncount < 0) {
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/* it's laughable, but... */
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warncount = 0;
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}
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memset(&tmp, 0, sizeof(struct __old_kernel_stat));
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tmp.st_dev = old_encode_dev(stat->dev);
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tmp.st_ino = stat->ino;
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if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
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return -EOVERFLOW;
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tmp.st_mode = stat->mode;
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tmp.st_nlink = stat->nlink;
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if (tmp.st_nlink != stat->nlink)
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return -EOVERFLOW;
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SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
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SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
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tmp.st_rdev = old_encode_dev(stat->rdev);
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#if BITS_PER_LONG == 32
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if (stat->size > MAX_NON_LFS)
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return -EOVERFLOW;
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#endif
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tmp.st_size = stat->size;
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tmp.st_atime = stat->atime.tv_sec;
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tmp.st_mtime = stat->mtime.tv_sec;
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tmp.st_ctime = stat->ctime.tv_sec;
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return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
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}
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SYSCALL_DEFINE2(stat, const char __user *, filename,
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struct __old_kernel_stat __user *, statbuf)
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{
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struct kstat stat;
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int error;
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error = vfs_stat(filename, &stat);
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if (error)
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return error;
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return cp_old_stat(&stat, statbuf);
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}
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SYSCALL_DEFINE2(lstat, const char __user *, filename,
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struct __old_kernel_stat __user *, statbuf)
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{
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struct kstat stat;
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int error;
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error = vfs_lstat(filename, &stat);
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if (error)
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return error;
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return cp_old_stat(&stat, statbuf);
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}
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SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
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{
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struct kstat stat;
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int error = vfs_fstat(fd, &stat);
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if (!error)
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error = cp_old_stat(&stat, statbuf);
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return error;
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}
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#endif /* __ARCH_WANT_OLD_STAT */
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#ifdef __ARCH_WANT_NEW_STAT
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#if BITS_PER_LONG == 32
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# define choose_32_64(a,b) a
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#else
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# define choose_32_64(a,b) b
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#endif
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#define valid_dev(x) choose_32_64(old_valid_dev(x),true)
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#define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
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#ifndef INIT_STRUCT_STAT_PADDING
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# define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
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#endif
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static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
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{
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struct stat tmp;
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if (!valid_dev(stat->dev) || !valid_dev(stat->rdev))
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return -EOVERFLOW;
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#if BITS_PER_LONG == 32
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if (stat->size > MAX_NON_LFS)
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return -EOVERFLOW;
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#endif
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INIT_STRUCT_STAT_PADDING(tmp);
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tmp.st_dev = encode_dev(stat->dev);
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tmp.st_ino = stat->ino;
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if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
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return -EOVERFLOW;
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tmp.st_mode = stat->mode;
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tmp.st_nlink = stat->nlink;
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if (tmp.st_nlink != stat->nlink)
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return -EOVERFLOW;
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SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
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SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
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tmp.st_rdev = encode_dev(stat->rdev);
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tmp.st_size = stat->size;
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tmp.st_atime = stat->atime.tv_sec;
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tmp.st_mtime = stat->mtime.tv_sec;
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tmp.st_ctime = stat->ctime.tv_sec;
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#ifdef STAT_HAVE_NSEC
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tmp.st_atime_nsec = stat->atime.tv_nsec;
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tmp.st_mtime_nsec = stat->mtime.tv_nsec;
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tmp.st_ctime_nsec = stat->ctime.tv_nsec;
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#endif
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tmp.st_blocks = stat->blocks;
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tmp.st_blksize = stat->blksize;
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return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
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}
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SYSCALL_DEFINE2(newstat, const char __user *, filename,
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struct stat __user *, statbuf)
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{
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struct kstat stat;
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int error = vfs_stat(filename, &stat);
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if (error)
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return error;
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return cp_new_stat(&stat, statbuf);
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}
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SYSCALL_DEFINE2(newlstat, const char __user *, filename,
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struct stat __user *, statbuf)
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{
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struct kstat stat;
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int error;
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error = vfs_lstat(filename, &stat);
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if (error)
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return error;
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return cp_new_stat(&stat, statbuf);
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}
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#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
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SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
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struct stat __user *, statbuf, int, flag)
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{
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struct kstat stat;
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int error;
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error = vfs_fstatat(dfd, filename, &stat, flag);
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if (error)
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return error;
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return cp_new_stat(&stat, statbuf);
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}
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#endif
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SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
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{
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struct kstat stat;
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int error = vfs_fstat(fd, &stat);
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if (!error)
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error = cp_new_stat(&stat, statbuf);
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return error;
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}
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#endif
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static int do_readlinkat(int dfd, const char __user *pathname,
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char __user *buf, int bufsiz)
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{
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struct path path;
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int error;
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int empty = 0;
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unsigned int lookup_flags = LOOKUP_EMPTY;
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if (bufsiz <= 0)
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return -EINVAL;
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retry:
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error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty);
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if (!error) {
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struct inode *inode = d_backing_inode(path.dentry);
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error = empty ? -ENOENT : -EINVAL;
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/*
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* AFS mountpoints allow readlink(2) but are not symlinks
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*/
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if (d_is_symlink(path.dentry) || inode->i_op->readlink) {
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error = security_inode_readlink(path.dentry);
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if (!error) {
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touch_atime(&path);
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error = vfs_readlink(path.dentry, buf, bufsiz);
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}
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}
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path_put(&path);
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if (retry_estale(error, lookup_flags)) {
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lookup_flags |= LOOKUP_REVAL;
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goto retry;
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}
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}
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return error;
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}
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SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
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char __user *, buf, int, bufsiz)
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{
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return do_readlinkat(dfd, pathname, buf, bufsiz);
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}
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SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
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int, bufsiz)
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{
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return do_readlinkat(AT_FDCWD, path, buf, bufsiz);
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}
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/* ---------- LFS-64 ----------- */
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#if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
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#ifndef INIT_STRUCT_STAT64_PADDING
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# define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
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#endif
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static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
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{
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struct stat64 tmp;
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INIT_STRUCT_STAT64_PADDING(tmp);
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#ifdef CONFIG_MIPS
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/* mips has weird padding, so we don't get 64 bits there */
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tmp.st_dev = new_encode_dev(stat->dev);
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tmp.st_rdev = new_encode_dev(stat->rdev);
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#else
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tmp.st_dev = huge_encode_dev(stat->dev);
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tmp.st_rdev = huge_encode_dev(stat->rdev);
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#endif
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tmp.st_ino = stat->ino;
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if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
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return -EOVERFLOW;
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#ifdef STAT64_HAS_BROKEN_ST_INO
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tmp.__st_ino = stat->ino;
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#endif
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tmp.st_mode = stat->mode;
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tmp.st_nlink = stat->nlink;
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tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
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tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
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tmp.st_atime = stat->atime.tv_sec;
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tmp.st_atime_nsec = stat->atime.tv_nsec;
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tmp.st_mtime = stat->mtime.tv_sec;
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tmp.st_mtime_nsec = stat->mtime.tv_nsec;
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tmp.st_ctime = stat->ctime.tv_sec;
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tmp.st_ctime_nsec = stat->ctime.tv_nsec;
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tmp.st_size = stat->size;
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tmp.st_blocks = stat->blocks;
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tmp.st_blksize = stat->blksize;
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return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
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}
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SYSCALL_DEFINE2(stat64, const char __user *, filename,
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struct stat64 __user *, statbuf)
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{
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struct kstat stat;
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int error = vfs_stat(filename, &stat);
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if (!error)
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error = cp_new_stat64(&stat, statbuf);
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return error;
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}
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SYSCALL_DEFINE2(lstat64, const char __user *, filename,
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struct stat64 __user *, statbuf)
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{
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struct kstat stat;
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int error = vfs_lstat(filename, &stat);
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if (!error)
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error = cp_new_stat64(&stat, statbuf);
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return error;
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}
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SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
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{
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struct kstat stat;
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int error = vfs_fstat(fd, &stat);
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if (!error)
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error = cp_new_stat64(&stat, statbuf);
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return error;
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}
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SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
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struct stat64 __user *, statbuf, int, flag)
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{
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struct kstat stat;
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int error;
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error = vfs_fstatat(dfd, filename, &stat, flag);
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if (error)
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return error;
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return cp_new_stat64(&stat, statbuf);
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}
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#endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
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static noinline_for_stack int
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cp_statx(const struct kstat *stat, struct statx __user *buffer)
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{
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struct statx tmp;
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memset(&tmp, 0, sizeof(tmp));
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tmp.stx_mask = stat->result_mask;
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tmp.stx_blksize = stat->blksize;
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tmp.stx_attributes = stat->attributes;
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tmp.stx_nlink = stat->nlink;
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tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid);
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tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid);
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tmp.stx_mode = stat->mode;
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tmp.stx_ino = stat->ino;
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tmp.stx_size = stat->size;
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tmp.stx_blocks = stat->blocks;
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tmp.stx_attributes_mask = stat->attributes_mask;
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tmp.stx_atime.tv_sec = stat->atime.tv_sec;
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tmp.stx_atime.tv_nsec = stat->atime.tv_nsec;
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tmp.stx_btime.tv_sec = stat->btime.tv_sec;
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tmp.stx_btime.tv_nsec = stat->btime.tv_nsec;
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tmp.stx_ctime.tv_sec = stat->ctime.tv_sec;
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tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec;
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tmp.stx_mtime.tv_sec = stat->mtime.tv_sec;
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tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec;
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tmp.stx_rdev_major = MAJOR(stat->rdev);
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tmp.stx_rdev_minor = MINOR(stat->rdev);
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tmp.stx_dev_major = MAJOR(stat->dev);
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tmp.stx_dev_minor = MINOR(stat->dev);
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tmp.stx_mnt_id = stat->mnt_id;
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return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0;
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}
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int do_statx(int dfd, const char __user *filename, unsigned flags,
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unsigned int mask, struct statx __user *buffer)
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{
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struct kstat stat;
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int error;
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if (mask & STATX__RESERVED)
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return -EINVAL;
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if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE)
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return -EINVAL;
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error = vfs_statx(dfd, filename, flags, &stat, mask);
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if (error)
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return error;
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return cp_statx(&stat, buffer);
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}
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/**
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* sys_statx - System call to get enhanced stats
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* @dfd: Base directory to pathwalk from *or* fd to stat.
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* @filename: File to stat or "" with AT_EMPTY_PATH
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* @flags: AT_* flags to control pathwalk.
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* @mask: Parts of statx struct actually required.
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* @buffer: Result buffer.
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*
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* Note that fstat() can be emulated by setting dfd to the fd of interest,
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* supplying "" as the filename and setting AT_EMPTY_PATH in the flags.
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*/
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SYSCALL_DEFINE5(statx,
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int, dfd, const char __user *, filename, unsigned, flags,
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unsigned int, mask,
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struct statx __user *, buffer)
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{
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return do_statx(dfd, filename, flags, mask, buffer);
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}
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#ifdef CONFIG_COMPAT
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static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
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{
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struct compat_stat tmp;
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if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
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return -EOVERFLOW;
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memset(&tmp, 0, sizeof(tmp));
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tmp.st_dev = old_encode_dev(stat->dev);
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tmp.st_ino = stat->ino;
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if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
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return -EOVERFLOW;
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tmp.st_mode = stat->mode;
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tmp.st_nlink = stat->nlink;
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if (tmp.st_nlink != stat->nlink)
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return -EOVERFLOW;
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SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
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SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
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tmp.st_rdev = old_encode_dev(stat->rdev);
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if ((u64) stat->size > MAX_NON_LFS)
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return -EOVERFLOW;
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tmp.st_size = stat->size;
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tmp.st_atime = stat->atime.tv_sec;
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tmp.st_atime_nsec = stat->atime.tv_nsec;
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tmp.st_mtime = stat->mtime.tv_sec;
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tmp.st_mtime_nsec = stat->mtime.tv_nsec;
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tmp.st_ctime = stat->ctime.tv_sec;
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tmp.st_ctime_nsec = stat->ctime.tv_nsec;
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tmp.st_blocks = stat->blocks;
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tmp.st_blksize = stat->blksize;
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return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
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}
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COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename,
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struct compat_stat __user *, statbuf)
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{
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struct kstat stat;
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int error;
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error = vfs_stat(filename, &stat);
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if (error)
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return error;
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return cp_compat_stat(&stat, statbuf);
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}
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COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename,
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struct compat_stat __user *, statbuf)
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{
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struct kstat stat;
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int error;
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error = vfs_lstat(filename, &stat);
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if (error)
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return error;
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return cp_compat_stat(&stat, statbuf);
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}
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#ifndef __ARCH_WANT_STAT64
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COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd,
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const char __user *, filename,
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struct compat_stat __user *, statbuf, int, flag)
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{
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struct kstat stat;
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int error;
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error = vfs_fstatat(dfd, filename, &stat, flag);
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if (error)
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return error;
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return cp_compat_stat(&stat, statbuf);
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}
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#endif
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COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
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struct compat_stat __user *, statbuf)
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{
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struct kstat stat;
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int error = vfs_fstat(fd, &stat);
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if (!error)
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error = cp_compat_stat(&stat, statbuf);
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return error;
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}
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#endif
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/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
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void __inode_add_bytes(struct inode *inode, loff_t bytes)
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{
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inode->i_blocks += bytes >> 9;
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bytes &= 511;
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inode->i_bytes += bytes;
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if (inode->i_bytes >= 512) {
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inode->i_blocks++;
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inode->i_bytes -= 512;
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}
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}
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EXPORT_SYMBOL(__inode_add_bytes);
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void inode_add_bytes(struct inode *inode, loff_t bytes)
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{
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spin_lock(&inode->i_lock);
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__inode_add_bytes(inode, bytes);
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spin_unlock(&inode->i_lock);
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}
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EXPORT_SYMBOL(inode_add_bytes);
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void __inode_sub_bytes(struct inode *inode, loff_t bytes)
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{
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inode->i_blocks -= bytes >> 9;
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bytes &= 511;
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if (inode->i_bytes < bytes) {
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inode->i_blocks--;
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inode->i_bytes += 512;
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}
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inode->i_bytes -= bytes;
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}
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EXPORT_SYMBOL(__inode_sub_bytes);
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void inode_sub_bytes(struct inode *inode, loff_t bytes)
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{
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spin_lock(&inode->i_lock);
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__inode_sub_bytes(inode, bytes);
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spin_unlock(&inode->i_lock);
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}
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EXPORT_SYMBOL(inode_sub_bytes);
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loff_t inode_get_bytes(struct inode *inode)
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{
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loff_t ret;
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spin_lock(&inode->i_lock);
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ret = __inode_get_bytes(inode);
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spin_unlock(&inode->i_lock);
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return ret;
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}
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EXPORT_SYMBOL(inode_get_bytes);
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void inode_set_bytes(struct inode *inode, loff_t bytes)
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{
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/* Caller is here responsible for sufficient locking
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* (ie. inode->i_lock) */
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inode->i_blocks = bytes >> 9;
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inode->i_bytes = bytes & 511;
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}
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EXPORT_SYMBOL(inode_set_bytes);
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